Firefighters monitor flood waters that spilled over a highway north of High River, Alta., on June 21, 2013.(Jordan Verlage/The Canadian Press)

Firefighter Cole Crawford peers through binoculars at flood waters that spilled over a highway north of High River, Alta., on June 21, 2013.(Jordan Verlage/The Canadian Press)

Firefighters monitor flood waters that spilled over a highway north of High River, Alta., on June 21, 2013.(Jordan Verlage/The Canadian Press)

A search and rescue boat carries rescued passengers from a flooded industrial site near a highway north of High River, Alta., on June 21, 2013. The rescued passengers spent the night moored on a structure they built in the water.(Jordan Verlage/The Canadian Press)

An RCMP cruiser blocks access to the Trans Canada Highway in Canmore, Alta. on June 20, 2013.(John Marriott/The Canadian Press)

Flood waters made banks along Cougar Creek unstable and dangerous on June 20, 2013. Many residents of Canmore, Alta., on the south side of the creek, have been forced to evacuate.(Laura Leyshon for The Globe and Mail)

Canmore, Alta., residents survey rising waters along Cougar Creek on June 20, 2013.(Laura Leyshon for The Globe and Mail)

Workers deal with high water levels on Cougar Creek in Canmore, Alta., on June 20, 2013.(Laura Leyshon for The Globe and Mail)

Rising waters in Canmore, Alta., on June 20, 2013.(Laura Leyshon For The Globe and Mail)

Local store fronts are under water in downtown High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning they declared a state of emergency at 9:20 a.m. and anyone who lived near a river, creek or stream was asked to leave. Recently heavy rains caused the river to break the banks which runs right through town.(Chris Bolin for The Globe and Mail)

Local store fronts are under water in downtown High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning they declared a state of emergency at 9:20 a.m. and anyone who lived near a river, creek or stream was asked to leave. Recently heavy rains caused the river to break the banks which runs right through town.(Chris Bolin for The Globe and Mail)

The main river breaks its banks and flows over the main bridge in downtown High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning they declared a state of emergency at 9:20 a.m. and anyone who lived near a river, creek or stream was asked to leave. Recently heavy rains caused the river to break the banks which runs right through town.(Chris Bolin for The Globe and Mail)

Local store fronts are under water in downtown High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning they declared a state of emergency at 9:20 a.m. and anyone who lived near a river, creek or stream was asked to leave. Recently heavy rains caused the river to break the banks which runs right through town.(Chris Bolin for The Globe and Mail)

A local drives through high water in downtown High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning they declared a state of emergency at 9:20 a.m. and anyone who lived near a river, creek or stream was asked to leave. Recently heavy rains caused the river to break the banks which runs right through town.(Chris Bolin for The Globe and Mail)

Employees at Sobeys wait behind sandbags at the main entrance in High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning 60 kms south of Calgary and declared a state of emergency at 9:20 a.m. They asked anyone who lived near a river, creek or stream to leave. Recently heavy rains caused the river to break the banks which runs right through downtown. Photo by Chris Bolin / For The Globe and Mail(Chris Bolin for The Globe and Mail)

Francois Gougeon, trips in deep water crossing the main road in High River, Alberta on Thursday, June 20, 2013. The town was under mandatory evacuation this morning 60 kms south of Calgary and declared a state of emergency at 9:20 a.m. They asked anyone who lived near a river, creek or stream to leave. Recently heavy rains caused the river to break the banks which runs right through downtown.(Chris Bolin for The Globe and Mail)